Exchange Rates and International Finance
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1 Exchange Rates and International Finance Week 12 Vivaldo Mendes Dep. of Economics Instituto Universitário de Lisboa 8 December 2017 (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
2 Summary 1 In this chapter, we learn 2 Exchange Rates in the Long Run 3 Exchange Rates in the Short Run 4 Fixed Exchange Rates 5 The Open Economy in the Short-Run Model 6 Exchange Rate Regimes 7 The Policy Trilemma 8 Required reading (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
3 I In this chapter, we learn (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
4 In this chapter, we learn In this chapter, we learn: 1 How nominal and real exchange rates are determined, in both the short run and the long run. 2 The key role played by the law of one price in determining exchange rates. 3 How to incorporate exchange rates and a richer theory of the open economy into our short-run model. 4 About international financial systems: 1 The gold standard 2 The Bretton Woods system 3 The current system of floating exchange rates 5 The lessons from recent financial crises in Mexico, Asia, Argentina, and Europe. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
5 In this chapter, we learn II Exchange Rates in the Long Run (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
6 Exchange Rates in the Long Run The Nominal Exchange Rate (E) 1 Normally, the exchange rate is the price of foreign currency How many we have to pay in order to have 1 Pound? 2 Is the rate that a currency trades for another 3 In the US, the problem is put the other way around: its the price of the dollar How many we have to pay in order to have 1 Dollar? 4 A depreciation of the dollar: 1 Decline in the price of the dollar 2 Decline in the exchange rate E = Number of $1 (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
7 Exchange Rates in the Long Run Exchange rate of the dollar versus the Yen and the Euro (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
8 Exchange Rates in the Long Run The Law of One Price 1 Says in the long run goods must sell for the same price in all countries 2 Implies that the exchange rate times the domestic price must equal the foreign price 3 If prices were different, the opportunity for arbitrage exists. Exchange rate Price of goods in U.S. World price Law may not hold exactly: different taxes, tariffs, and transportation costs If it holds, it gives the level of the nominal Exchange rate (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
9 Exchange Rates in the Long Run The Law of One Price If it holds, it gives the level of the nominal Exchange rate Nominal Exchange Rate Long run price ratio In the long run: the exchange rate is determined by the amount of money in one country relative to another. Why? Because Prices are determined by the amount of money in each country If the dollar depreciates: ( ) ( ) Number of P w E = = $1 P (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
10 Exchange Rates in the Long Run Inflation in the US and Japan 1 Higher inflation in the United States than in Japan is one reason for the depreciation of the dollar relative to the yen since the 1970s. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
11 Exchange Rates in the Long Run Case Study: The Big Mac Index 1 The law of one price fails to hold for Big Mac (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
12 Exchange Rates in the Long Run The Real Exchange Rate The real exchange rate (RER) RER = Number of P $1 P ( ) ( ) ( ) Number of P P = $1 P = E P If the nominal exchange rate gives the power of a foreign currency to buy 1 US dollar The real exchange rate gives the power of a foreign currency to buy US goods With 1000, how many Big Macs in the US can I buy? Not, how many dollars can I buy? If the Law of one price holds, then ( ) ( P P RER = E P = P ) ( ) P P = 1. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
13 Exchange Rates in the Long Run III Exchange Rates in the Short Run (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
14 Exchange Rates in the Short Run The Nominal Exchange Rate in the short run 1 Why trade currencies? 2 The average foreign exchange traded around the world is $4 trillion per day. 3 Many reasons explain this flow: 1 To facilitate international trade 2 Traders in financial markets demand currencies in order to make financial transactions. 3 Speculation in the currencies markets 4 So, the price of two currencies may be determined by many factors in the short term 5 By the interaction of demand vs supply (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
15 Exchange Rates in the Short Run When the FED increases interest rates in the US 1 Foreign investors are attracted to purchase U.S. bonds. 2 Foreign traders need dollars to make these purchases. 3 Demand for dollars increases. 4 The exchange rate then appreciates: the value of the dollar increases E changes by the minute. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
16 Exchange Rates in the Short Run The Real Exchange Rate in the short run 1 The RER changes slower that E 2 Remember that the Real Exchange rate is ( ) P RER = E P 3 Sticky inflation implies that prices (P and Pw) adjust slowly over time 4 Prices are revised not daily: monthly, quarterly, etc.. 5 So movements in the nominal exchange rate translate into movements in the real exchange rate in the short run: (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
17 Exchange Rates in the Short Run How nominal and real exchange rates are determined (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
18 Exchange Rates in the Short Run IV Fixed Exchange Rates (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
19 Fixed Exchange Rates Fixed exchange rates 1 Systems where the exchange rate for one currency is pegged to a particular level for some period 2 The Central Bank must have enough foreign reserves to sustain the "fixing". 3 To maintain fix of an exchange rate: the money supply must change by the same amount as the money supply in the country to which the currency is fixed. 4 If the Central Bank exhausts the stock of foreign reserves, money supply in the countries diverge and the fixing is broken by the market pressure. 5 Why fix exchange rates? To control inflationary pressures, to reduce volatility. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
20 Fixed Exchange Rates V The Open Economy in the Short-Run Model (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
21 The Open Economy in the Short-Run Model The exchange rate affects Net Exports 1 Now: movements in the real exchange rate can influence trade. Domestic real interest rate World real interest rate Medium run trade balance Business cycle considerations Why? (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
22 The Open Economy in the Short-Run Model The New IS Curve The IS curve will take a similar form: The aggregate demand parameters are defined differently: (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
23 The Open Economy in the Short-Run Model Event #1: Tightening Domestic Monetary Policy 1 What happens when the central bank raises nominal interest rates to tighten monetary policy? 2 Sticky inflation causes the real interest rate to rise. 3 Since the real interest rate exceeds the MPK 4 Firms reduce demand for investment, lowering short run output. 5 The demand for dollar-denominated financial assets increases, causing the real exchange rate to appreciate. 6 Net exports decline. 7 Short-run output falls even farther. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
24 The Open Economy in the Short-Run Model An increase in the domestic interest rate (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
25 The Open Economy in the Short-Run Model Event #2: A Change in Foreign Interest Rates 1 What is the effect on the United States if the European Central Bank raises interest rates in the euro area? 2 Investors will demand more euros and fewer dollars. 3 The euro will appreciate. 4 The US exports will become cheaper in the EUroZone 5 The IS curve shifts out as the aggregate demand parameter is shocked. 6 The aggregate demand increases (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
26 The Open Economy in the Short-Run Model The European Central Bank raises interest rates (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
27 The Open Economy in the Short-Run Model VI Exchange Rate Regimes (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
28 Exchange Rate Regimes The three main phases 1 The era of the gold standard 2 The era of the Bretton Woods system 3 The modern era of floating exchange rates where exchange rates are allowed to move flexibly (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
29 Exchange Rate Regimes The three main phases 1 The gold standard: 1 Countries specified a fixed price in which they were willing to trade their currency for gold. 2 The Bretton Woods system 1 The United States pegged the dollar to a specified price of gold. 2 Other countries pegged their currencies to the dollar. 3 Floating exchange rates 1 Supply and demand for foreign exchange determine the value of the nominal exchange rate. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
30 Exchange Rate Regimes The UK vs US exchange rate (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
31 Exchange Rate Regimes VII The Policy Trilemma (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
32 The Policy Trilemma The Policy Trilemma 1 The international monetary system has three main goals: 1 Stable exchange rates 2 Monetary policy autonomy 3 Free flows of international finance 2 The policy trilemma: 1 The principle that at most only two of the three goals can be achieved simultaneously within a country (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
33 The Policy Trilemma The Policy Trilemma (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
34 The Policy Trilemma Which Side of the Triangle to Choose? 1 The costs and benefits of giving up a particular goal may differ across countries and time. 2 For example, individual countries in the EuroZone gave up autonomous monetary policy. 3 Argentina the same with the so called "dollarization" in the 1990s 4 The South East Asian economies decided to peg their currencies to the US dollar in the early 1990s: they gave up a relevant part of autonomous monetary policy as well 5 Giving up autonomous monetary policy may be very dangerous (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
35 The Policy Trilemma The dangerous side of loosing autonomy (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
36 The Policy Trilemma VIII Required readings (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
37 The Policy Trilemma Required reading For this week you are required to read Read Chapter 20 of our adopted textbook. Charles I. Jones (2014). Macroeconomics, Third Edition, W. W. Norton & Company. (Vivaldo Mendes ISCTE-IUL ) Macroeconomics I (L0271) 8 December / 37
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